Testing sendmail greet_pause FEATURE

Scenario: we are considering implementing the sendmail greet_pause
FEATURE, but we do not want to actually reject connections while we
gather statistics (e.g. legitimate domains to whitelist, optimal greet_pause value).

By commenting out two lines in srvrsmtp.c in the sendmail source, and rebuilding and reinstalling sendmail, we can simulate the greet_pause FEATURE and log its results without actually rejecting commands sent in the SMTP session.

The following steps were performed on a sendmail8.13.6 installation.
1. $ cd sendmail-8.13.6/sendmail